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Site Background Information Five Star Manna <br /> Page 3 of 8 <br /> I <br /> while diesel-impacted water was documented along the western edge of the property boundary <br /> ' On 01 and 05 December 1997, a total of ten soil probe boring (P16 to P25) were established <br /> surrounding the East UST area Locations of the soil probe borings are illustrated on Figure 2 <br /> TPH-g and BTEX were detected in soil samples collected from the probe borings at concentrations <br /> as high as 2,100 mg/kg and 14 mg/kg(xylenes),respectively Hydrocarbon-impacted soil associated <br /> with the East UST area appeared to be limited to the former dispenser area (southern edge of <br /> Lindsay Street),and to a depth of 16 feet to 17 feet bsg, in the saturated soil below the ground water <br /> table <br /> ' TPH-g was detected in six of eleven grab ground water samples collected from the East UST area <br /> at concentrations ranging from 53 p,g/l to 100,000 µg/1 BTEX was detected in eight of eleven <br /> samples analyzed at concentrations ranging from 0 55 µg/l to 1,700 µg11 <br /> Results of soil and grab ground water samples from site investigations are summarized in Tables A 1, <br /> A2, A3, and A4 of this appendix <br /> ' . 1n January 1998, four ground water monitoring wells were installed near the West UST area to <br /> quantify the hydrocarbon concentration in ground water and determine the direction of ground <br /> water flow Results of the well installation and subsequent sampling delineated the dissolved <br /> hydrocarbons and indicated direction of ground water flow to be generally toward the northeast <br /> Ground water monitoring enabled delineation of the dissolved hydrocarbon plume, with concern <br /> for the possible migration of the plume away from the West UST area Locations of the <br /> ' monitoring wells are illustrated on Figure 2 <br /> The destruction of monitoring well MW-UST was performed on 15 February 2005 by Mitchell <br /> ' Drilling Environmental of Rancho Cordova., California under FHD oversight As per verbal <br /> instructions given in the field by EHD personnel, well destruction activities were performed <br /> uti1171ng a CMF-75HT truck-mounted drill ng to pull approximately one-half of the well easing <br /> ' out of tht 15-foot boring The boring, with the remaining portion of the well catling in place, was <br /> backfilled to surface grade with type 1111 portland Lenient <br /> ' On 01 f)eceinbet 2005, tllrce additional shallow ground Nvatet monitoring wells (MW-7, MV1-8, <br /> and MW-9) were installed at the tint 1'dot borings MW7 through MW9 were completed as <br /> giound `dater monitoring wells of the sarfiL designations (MW 7 through MW-9) using 2-inch <br /> ' diameter poi)\ inylc.hlondc (PV( ) casing with a 0 020-Inch slotted screen instilled from 5 Fccr to <br /> 20 fest hsg <br /> ' ,)il IC rrn I "'In'irrl� "'006 s'li1 r3roh.- bonnor, 111 , R-) ,in(l RI \%rir idl ,inc( d gyri Ji( <br /> Alliiii-ig a Vdn-i OU11t, l (ru )pitlht 5400 direct-Bush piobing unit h(1\\Loci a(hOncLnlent c scl 1 <br /> <illlt I-Io nt, 13 , 11 (lept11 "1"' 1 It 11c1i Ehlc to L 411111 <br /> idtun,rdaoi ntinurtntu s !Fn <br />